Registration Dossier
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EC number: - | CAS number: -
Partition coefficient
Administrative data
Link to relevant study record(s)
- Endpoint:
- partition coefficient
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 107 (Partition Coefficient (n-octanol / water), Shake Flask Method)
- GLP compliance:
- no
- Type of method:
- flask method
- Partition coefficient type:
- octanol-water
- Analytical method:
- photometric method
- Type:
- log Pow
- Partition coefficient:
- ca. -2.557
- Temp.:
- 20 °C
- pH:
- ca. 6.58
- Type:
- Pow
- Partition coefficient:
- ca. 0.003
- Temp.:
- 20 °C
- pH:
- ca. 6.58
- Conclusions:
- At pH 6.58 and T 20°C, log Pow = -2.5567.
- Executive summary:
Method:
Partition coefficient was determined by shake flask method as described in OECD guideline 107. Partition coefficient (P) is defined as the ratio of the equilibrium concentrations of a dissolved substance in a two-phase system consisting in two largely immiscible solvents.
Result:
As a mean of 3 measures at 20°C and at pH of 6.58: Pow: 0.0028 and log Pow: -2.5567.
Reference
At 96 hours values reached equilibrium, and so this value was considered for final calculations making duplicate determinations of every ratio o/w.
Concentration of mother solution: W1 = 0.0400 g/100 mL = 0.4000 g/L
| Ratio o/w | Water phase | n-octanol phase | Pow | log Pow | Average log Pow |
| c (g/l) | c (g/l) | ||||
| 70 / 30 | 0.3995 | 0.0011 | 0.0028 | -2.549529 | -2.5495 |
| 70 / 30 | 0.3995 | 0.0011 | 0.0028 | -2.549529 | |
| 50 / 50 | 0.3990 | 0.0010 | 0.0024 | -2.615950 | -2.6160 |
| 50 / 50 | 0.3990 | 0.0010 | 0.0024 | -2.615950 | |
| 30 / 70 | 0.3971 | 0.0012 | 0.0031 | -2.504697 | -2.5047 |
| 30 / 70 | 0.3971 | 0.0012 | 0.0031 | -2.504697 | |
| pH of the test solution: | 6.58 |
| |||
average Pow | 0.0028 | average log Pow | -2.5567 | ||
std. dev. Pow | 0.0004 | std. dev. log Pow | 0.056 | ||
Description of key information
-2.5567 at 20°C and pH 6.58
Key value for chemical safety assessment
- Log Kow (Log Pow):
- -1
- at the temperature of:
- 20 °C
Additional information
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